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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4149

Title: UNUSUALLY LOW-ENERGY ELECTRONIC-TRANSITIONS IN POLY(DIACETYLENE) SOLUTIONS - SOLVATOCHROMIC AND THERMOCHROMIC BEHAVIOR OF POLY(1,4-BIS(3-QUINOLYL)BUTA-1,3-DIYNE)
Authors: KODALI, NB
KIM, W
KUMAR, J
TRIPATHY, SK
TALWAR, SS
Keywords: conjugated ionic polyacetylenes
soluble polydiacetylenes
coil transition
neutral coils
rod
polymerization
scattering
crystals
spectra
raman
Issue Date: 1994
Publisher: AMER CHEMICAL SOC
Citation: MACROMOLECULES, 27(22), 6612-6619
Abstract: Solutions of poly(1,4-bis(3-quinolyl)buta-1,3-diyne) (PDQ) have shown the lowest energy electronic transitions of all the reported poly(diacetylene)s. Unusual solvato- and thermochromic behavior of PDQ in various polar and nonpolar environments is discussed. The role of hydrogen bonding appears crucial to the solution and chromic behavior in these solutions. pi-Conjugation between the polymer backbone and the cross-conjugated heteroaromatic side groups appears to lead to chain segments with unusually extensive electron delocalization. Stable (over a period of 2 years), dark green, true solutions in phenol-acetonitrile (nonsolvent) (lambda(max) = 733 nm) are obtained. The stability of charged and rigid rod-like PDQ macromolecules is explained in terms of screening of interchain Coulombic interactions.
URI: http://dx.doi.org/10.1021/ma00100a054
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4149
http://hdl.handle.net/10054/4149
ISSN: 0024-9297
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